The instructors here refer to the G Pentatonic Pattern a lot. 

The keyword here is PATTERN. This shape is based on the Open G Chord. The position of this shape determines the key.

Charlie explains everything in full detail in this video here:

How To Instantly Solo In Any Key

>> https://www.youtube.com/watch?v=tC-Ne_IriNc

In the video, Charlie uses the G Pentatonic Pattern on the 5th fret of the Low E String.  This means that the scale is now in the key of A minor.

We can use this shape anywhere on the fretboard to play in any key. For example, If we take this same shape and move it up 2 frets to start on the 7th fret, we are now in the key of B minor.

After watching the video above, you'll be able to solo in any key using this pattern ;-)

Have fun!